lyx fonts

Hello. I'm using SuSE 9.0 and LyX 1.3.2, and I can't see math symbols like greek characters or the integral symbol. If I start lyx from an xterm/konsole, the message Adding /usr/share/lyx/xfonts/ to the font path appear in the xterm, but no math symbols are displayed on the lyx window. I tried adding /usr/share/lyx/fonts in a FontPath entry in /etc/X11/XF86Config, then tried use the X font server with that entry on its configuration file, also tried to install the equivalent truetype fonts from latex-xft-fonts, and nothing works. I'm using XFree86 4.3.0. Any ideas?